Examples

Another point, a rel = shorturl is rev = canonical by definition, thus if you were to use rel = shorturl and @rev were alive and well as it should be, you should automatically add rev = canonical (even though it is implied).

If you remove something with use you cause confusion on multiple fronts: first people have to become aware of the change, then they need to understand why the change was made, then they need to make the changes to their code base, and finally when they want to express rev = canonical with a @rel value, debates over what best @rel value represents the equivalent of another @rel value if it were used in @rev occur ..